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Instead of elongated cartridge, powerful propellant are being used, Example can be 5.56x30mm of INSAS amogh carbine ..
2900fps is more than enough, what scientist did is to make it smokeless, New generation OFB 5.56 x 45mm hardly make smoke when fired ..
2900fps is more than enough, what scientist did is to make it smokeless, New generation OFB 5.56 x 45mm hardly make smoke when fired ..
I dont mean totally new round, just the case will be longer to have more propellant charge while keeping 5.56x45mm diameter projectile.